Development of Sodium–Ion Conducting Sulfide Electrolytes

Abstract

All-solid-state sodium batteries are promising rechargeable batteries owing to their safety, cost effectiveness, long cycle life, and high gravimetric energy density. To realize these batteries, a key material is a sodium–ion-conducting solid electrolyte with high Na+ ion conductivity, appropriate mechanical properties, and moderate chemical and electrochemical stability. Sulfide electrolytes are currently the best choice for balancing these requirements. Na3PS4 and Na3BS3 glass-based electrolytes and W-doped Na3SbS4 crystalline electrolytes were developed for application in all-solid-state Na/S batteries with high capacities and long cycle lives.